logDet.corStruct {nlme} | R Documentation

## Extract corStruct Log-Determinant

### Description

This method function extracts the logarithm of the determinant of a square-root factor of the correlation matrix associated with `object`, or the sum of the log-determinants of square-root factors of the list of correlation matrices associated with `object`.

### Usage

    ## S3 method for class 'corStruct':
    logDet(object, covariate, ...)

### Arguments

`object` | an object inheriting from class `corStruct`, representing a correlation structure.
`covariate` | an optional covariate vector (matrix), or list of covariate vectors (matrices), at which values the correlation matrix, or list of correlation matrices, are to be evaluated. Defaults to `getCovariate(object)`.
`...` | some methods for this generic require additional arguments. None are used in this method.

### Value

the log-determinant of a square-root factor of the correlation matrix associated with `object`, or the sum of the log-determinants of square-root factors of the list of correlation matrices associated with `object`.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`logLik.corStruct`, `corMatrix.corStruct`

### Examples

    cs1 <- corAR1(0.3)
    logDet(cs1, covariate = 1:4)

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